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One hundred eighty-nine Corriedale ewes were used during the non-breeding season to study the “ram effect” stimulus after priming with progestogens. Intravaginal sponges containing either medroxyprogesterone acetate (MAP group, n = 49), fluorogestone acetate (FGA group, n = 49), or progesterone devices (CIDR group, n = 46) were inserted on Day -6 (Day 0 = introduction of the rams). Forty-five ewes were untreated and kept as a control group. On Day 0 the sponges were removed and rams provided with marking harnesses for oestrous detection were placed with the ewes. Onset of estrus was monitored until Day 25, and conception was determined by transrectal ultrasonography. Ewes came into heat during 4 periods: Days 0–3, 5–7, 17–20, and 21–23. The overall number of oestrus ewes were 29%, 53%, 35%, and 50% for the control, MAP, FGA, and CIDR groups, respectively (MAP and CIDR > control, p < 0.05). Control ewes presented oestrus only on Days 17–20 and 21–23. Oestrus in the progestogen-primed ewes was concentrated during Days 0–3 and 17–20, and some ewes came into oestrus on Days 5–7. There were no differences between different primings neither in oestrous response nor in conception rate. The conception rate from matings occurring on Days 0–3 was higher than on those occurring on Days 17–20. We conclude that MAP, FGA, and CIDR is equally effective in improving the response to the ram effect, and the pattern of oestrus in primed ewes was different than previously reported.

Response of Corriedale Ewes to the “Ram Effect” after Priming with Medroxyprogesterone, Fluorogestone, or Progesterone in the Non-Breeding Season